[BUG] /tmp/claude-settings-{hash}.json permission conflict when multiple macOS users run SSH sessions simultaneously

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description

When two different macOS users on the same remote host each open an SSH session in Claude Code Desktop simultaneously, the second user's session crashes immediately with exit code 1.

Root cause: Claude Code Desktop spawns ccd-cli with --settings {} on the remote host. The resulting settings file is written to /tmp/claude-settings-44136fa355b3678a.json using a deterministic hash of the settings content ({}). Since both users receive identical empty settings, the hash — and therefore the filename — is identical. The file is created with user-only permissions (owned by the first user). When the second user's session tries to open the same path, it receives EACCES: permission denied.

What Should Happen?

Expected Behavior

Multiple users on the same remote host should be able to run concurrent SSH sessions without file permission conflicts.

Suggested Fix

Include the remote user's UID or username in the filename, e.g.:

/tmp/claude-settings-{uid}-{hash}.json

Or write the settings file to the user's home directory instead of /tmp/:

~/.claude/claude-settings-{hash}.json

Error Messages/Logs

From `~/Library/Logs/Claude/ssh.log` on the local Mac:


[warn] [RemoteProcess] stderr: Error processing settings: EACCES: permission denied, open '/tmp/claude-settings-44136fa355b3678a.json'
[info] [RemoteProcess] Exited, code=1, duration=196ms

Steps to Reproduce

Steps to Reproduce

1. Two macOS users (userA, userB) exist on a remote Mac
2. Both have Claude Code properly configured (~/.claude.json, CLAUDE_CODE_OAUTH_TOKEN set)
3. Open Claude Desktop App → Code tab → SSH session as userA → start session ✅
4. Open a second SSH session as userB on the same remote host → send first message
5. Session crashes: Claude Code process exited with code 1

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Code CLI: v2.1.128, Claude Desktop for Mac Claude 1.6608.2 (ebf1a1) 2026-05-08T23:17:27.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Environment

• Claude Desktop App (macOS)
• Claude Code via SSH session (Code tab)
• Remote host: macOS (Mac Studio)
• Multiple local macOS users connecting via SSH to the same remote host
• Claude Code CLI: v2.1.128

Workaround

Pre-create the file with world-writable permissions in each user's ~/.zshenv on the remote host:

# ~/.zshenv (remote host, per user)
touch /tmp/claude-settings-44136fa355b3678a.json
chmod 666 /tmp/claude-settings-44136fa355b3678a.json

Note: /tmp is cleared on reboot. For a persistent fix, add this to a LaunchDaemon or equivalent.

Suggested Fix

Include the remote user's UID or username in the filename, e.g.:

/tmp/claude-settings-{uid}-{hash}.json

Or write the settings file to the user's home directory instead of /tmp/:

~/.claude/claude-settings-{hash}.json